Suppressors Quietest 5.56/,223 with suppressor that CYCLES?

[sig716shot]

I have a couple of rigs I have been shooting, hunting, and just plain playing with that are quite fun with my suppressors. I have a 300BLK SBR upper that we all know is quiet and subsonic .308 out of a bolt gun even more so. Well I figured since I already have my 7.62 can (A YHM 7.62 QD SS) I'd put on the yhm 5.56 mount and run some rounds through it. I got to tell you, although I would certainly say you dont "need" hearing protection, it did indeed still have a pop. 22mag equivalent maybe? I was somewhat shocked that 55gr .223 would be so much more load through the 7.62 can than even the full power 168-175gr full power .308 loads I shoot. I started to think about it a little more and I had some theories I suppose. One, the 7.62 suppressor lets out more gas when shooting .223 through it vs. .308. And two, the 55gr .223 was muzzling about 3220fps vs the 2680 or so out of my 18in bolt gun. Just my assumption. SO I guess my question to all this boils down to what are the quietest loads 5.56/.223 you have experience with out of a suppressor? Im wondering if the 75-77gr .223 match and bthp loads that fly around 2700-2780fps (would have to chronograph my 14.5in 5R POF) would be any quieter? I shouldn't have such a big gap in sound suppression between calibers in this can should I?
here are a couple of the guns I mount it on as pictures speak a thousand words.

Current setup

 

[Elnino31]

Re: Quietest 5.56/,223 with suppressor that CYCLES?

A 5.56 round is not a quiet round when suppressed. I doubt you ll gain any noticeable difference in sound by substituting different loads. Plus using a 7.62 can on a 5.56 will not help either.

There are 308 cans out there that suppress a 5.56 well, but I don't know if the yhm is one of them.

 

[Ring]

Re: Quietest 5.56/,223 with suppressor that CYCLES?

the smaller the bullet, the smaller the shockwave... 40gr vmax and 75gr amax in 223 with have louder sonic booms, while the muzzle sounds will be the same..

 

[DOA]

Re: Quietest 5.56/,223 with suppressor that CYCLES?

Maybe try subsonic 5.56?

 

[KYS]

Re: Quietest 5.56/,223 with suppressor that CYCLES?

Extreme Shock offers loaded ammo that WILL CYCLE the action when suppressed. Its very quiet. I have some and use it for critters that get close to the house. Works just fine.

223100ASP20
5.56MM 100gr ASP (ADVANCED SUBSONIC ROUND) Will function the action of M4 / M16 in 14", 16", 20" barrels with a suppressor!
980 fps Full-Cycling. 20 Round Box